1: Fully balanced output

2: Pure Class A circuit

3: High-power tube

4: High-power transformer

5: Filtering large reservoirs

6: Two-level power intelligent switching

7: Patent for automatic power conversion

8: Switch between A/A and B

9: Sub-cavity and sub-chamber structure

10: 1W standby

The circuit design of AD-1PA adopts the fully balanced transmission and amplification method respected by the audio industry, namely: fully symmetrical, fully balanced, differential input to BTL (bridged) power output. This circuit form can automatically cancel out the signals that may produce interference inside the power amplifier when superimposed on the terminal of the amplifier, which improves the purity of the replayed music and obtains a more pleasant sound quality.

This circuit form, commonly known as the diamond-type differential mirror amplifier circuit, has a high reputation in the H-END industry. Its advantages are large dynamics, strong driving force, high conversion rate, low harmonic distortion, low noise, good transient response, high linearity, and very good frequency characteristics.

 The addition of the common emitter base circuit can better improve the frequency bandwidth of the amplifier, especially the linearity at high frequencies, so that the high frequency response is better, the extension is higher, the high frequency music resolution is better, and the sound is better. See delicate and oily and transparent

AD-1PA's main gain source is the current output stage, which uses a five-stage Darlington differential BTL (bridge-connected) power output circuit. The driving force of this output circuit is very strong and dynamic, which greatly improves the damping coefficient of the power amplifier. For the display of the grand sound field, the sound pressure is further improved, the position of the sound is accurately located, and the control of the speaker is improved to make it free to send and receive power. Indispensable.

Mandatory Class AB mode: The power amplifier is maintained in Class AB mode.

AUTO mode: According to the temperature of the machine, it will automatically switch to Class A/Class B mode

Mandatory Class A mode: the power amplifier remains in Class A mode

1: AD-1PA uses HD-END high-precision paired TTC5200 and TTA1943 high-power famous tubes. The performance of the tube is quite stable when the working current has a large range of changes, and it will basically not affect the sound quality.

2: TTC5200/TTA1943 saturation voltage conduction curve test graphs are almost overlapped, the upper and lower internal resistance characteristics of the push-pull amplification of the pair of tubes are very close, so the amplified waveform has high positive and negative symmetry and less distortion.

3: The tube performs well in the whole frequency domain, with fine texture, oily, full tone, transparent, and strong resolution; it will neither appear dull in the low frequency nor feel ridiculous in the high frequency, and has strong plasticity. This is not only a style favored by sound designers and school musicians, but also a good sound pursued by the majority of audiophiles.

In the upper compartment of the AD-1PA machine is a large filtering pond composed of 16 ToneWinner audio-specific customized high-quality electrolytic capacitors with a total capacity of 180,000 microfarads.